Re: Batman-adv packet retranslation

[Sven Eckelmann <sven@narfation.org>]

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On Sunday, 24 May 2020 16:43:55 CEST Alexey Ermakov wrote:
> Sorry, I didn't provided full information about experiment conditions.
[...]
> 6) batctl hardif eth0 to 100                NOTE: If sklip this step,
> all works fine!
> 
> After this I started host bridge interface br0. NOTE: if bridge had
> started before batman configured all works fine

As Marek pointed  out, you told batman-adv that the  eth0 interfaces have for 
some reason a link speed of 0.1 [Mbit/s] (or 1 [100Kbit/s] - what the actual 
unit is for B.A.T.M.A.N. V). And unfortunately, 88% (for the hop penalty) of 1 
[100 Kbit/s] is in integer arithmetic 0 [100 Kbit/s]. And 0 whatever/s is just 
discarded by B.A.T.M.A.N. V [1] and not considered for routing traffic - hey, 
this path ends up as being 0 and therefore useless.

The reason why you want to set the link to 1 [100 Kbit/s] has to be figured 
out by yourself. But for a (during forwarding) strictly monotonic decreasing, 
integer value, it is a bad starting point to set it to 1 [whatever-unit] for a 
multi-hop setup.

Kind regards,
	Sven

[1] https://git.open-mesh.org/batman-adv.git/blob/e946e0beec5764ed5182943bf764f8793f1364bf:/net/batman-adv/bat_v_ogm.c#l880

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